Continuity mistake: On the long shot of Roy's first strike in 1979, the 7 pin is standing. In the closeup, the 7 pin is gone before the ball hits. (00:03:00)
Revealing mistake: You can clearly see a stick being used to ensure a strike after Roy tells Ishmael to step 2 boards to the left. (00:18:00)
Factual error: There is no Brimfield in Pennsylvania. The Lancaster Bowl employee tells Roy that Ishmael is from an Amish community in Brimfield. (00:19:39)
Suggested correction: Films, TV shows, and books regularly make up city names that don't constitute mistakes.
Continuity mistake: When they're driving along after the fight in the diner, the scenery in the background is different in the shots of just Roy to the shots of all three. (00:55:00)
Revealing mistake: In the middle of the movie, Roy is flossing his teeth by himself. In the mirror as well as when he turns around, you can see his hand holding the hook, if you look closely. (00:58:33)
Revealing mistake: Munson's nose starts bleeding before Claudia hits him. (01:00:53)
Continuity mistake: Ishmael (Randy Quaid) clearly has a tattoo of a four leaf clover on his chest when he is rescued from the strip club, well before they even make it to Reno, where he allegedly gets the tattoo. (01:08:20)
Revealing mistake: Just when Ernie Mcracken wins the $1,000,000 and everybody crowds round to talk to him, you can clearly see Roy's hand popping out (and I think that the hook is hidden in the towel he has). (01:34:50)
Continuity mistake: At the tournament, there is a quick shot of Ishmael sitting beside Roy while Big Ern is bowling, long after Ishmael's brother took him home. (01:40:00)
Continuity mistake: When Bill Murrary is bowling his last frame in the finals there is a man 4 rows up standing right next to the ESPN booth on the left side of the screen. In one shot he has a brown jacket on but in another the jacket is gone and then back on again. (01:40:50)
Factual error: During the movie, which is based in '79, Roy has a Rhino bowling ball. Rhinos weren't made until '85.
Continuity mistake: The handles move on the foosball table during the scene at Stanley's house, even though nobody was near the game.
Factual error: In the scene that takes place in 1969, the car in the garage next door is a 1973 Buick.
Continuity mistake: When Munson is on the bridge right before he backs up to tell Ishmale he passed the test, he has a vision in his mirror of his nasty landlord. When the vision ends he folds his mirror up, but the next shot when he's backing up, the mirror is back to it's original position.
Continuity mistake: The napkin in Ishmael's collar gets bunched up when he punches Ernie, then immediately reverts to how it had been before the altercation.
Factual error: The US postal logo shown on the postbox was not used until after 1979.
Other mistake: At the start of the tournament, Big Earn steps beyond the foul line in his first frame.
Continuity mistake: In the final match between Roy and Big Ern, Big Ern throws his second ball in the tenth frame and has removed his silver neck scarf thing, but when he turns towards the crowd, the camera angle that shows the back of Big Ern shows the scarf around his neck once again.
Revealing mistake: In the scene where Munson is lying in bed and his hook is in the radio if you look closely you can see that his whole hand is in the radio and the hook on top of his wrist.
